Update time & date references

Author: nickmcintyre

src/utilities/time_date.js

@@ -8,17 +8,32 @@
 import p5 from '../core/main';
 
 /**
- * p5.js communicates with the clock on your computer. The <a href="#/p5/day">day()</a> function
- * returns the current day as a value from 1 - 31.
+ * Returns the current day as a number from 1–31.
  *
  * @method day
- * @return {Integer} the current day
+ * @return {Integer} current day between 1 and 31.
+ *
  * @example
  * <div>
  * <code>
- * let d = day();
- * text('Current day: \n' + d, 5, 50);
- * describe('Current day is displayed');
+ * function setup() {
+ *   createCanvas(100, 100);
+ *
+ *   background(200);
+ *
+ *   // Get the current day.
+ *   let d = day();
+ *
+ *   // Style the text.
+ *   textAlign(LEFT, CENTER);
+ *   textSize(12);
+ *   textFont('Courier New');
+ *
+ *   // Display the day.
+ *   text(`Current day: ${d}`, 20, 50, 60);
+ *
+ *   describe(`The text 'Current day: ${d}' written in black on a gray background.`);
+ * }
  * </code>
  * </div>
  */
@@ -27,17 +42,32 @@ p5.prototype.day = function() {
 };
 
 /**
- * p5.js communicates with the clock on your computer. The <a href="#/p5/hour">hour()</a> function
- * returns the current hour as a value from 0 - 23.
+ * Returns the current hour as a number from 0–23.
  *
  * @method hour
- * @return {Integer} the current hour
+ * @return {Integer} current hour between 0 and 23.
+ *
  * @example
  * <div>
  * <code>
- * let h = hour();
- * text('Current hour:\n' + h, 5, 50);
- * describe('Current hour is displayed');
+ * function setup() {
+ *   createCanvas(100, 100);
+ *
+ *   background(200);
+ *
+ *   // Get the current hour.
+ *   let h = hour();
+ *
+ *   // Style the text.
+ *   textAlign(LEFT, CENTER);
+ *   textSize(12);
+ *   textFont('Courier New');
+ *
+ *   // Display the hour.
+ *   text(`Current hour: ${h}`, 20, 50, 60);
+ *
+ *   describe(`The text 'Current hour: ${h}' written in black on a gray background.`);
+ * }
  * </code>
  * </div>
  */
@@ -46,17 +76,32 @@ p5.prototype.hour = function() {
 };
 
 /**
- * p5.js communicates with the clock on your computer. The <a href="#/p5/minute">minute()</a> function
- * returns the current minute as a value from 0 - 59.
+ * Returns the current minute as a number from 0–59.
  *
  * @method minute
- * @return {Integer} the current minute
+ * @return {Integer} current minute between 0 and 59.
+ *
  * @example
  * <div>
  * <code>
- * let m = minute();
- * text('Current minute: \n' + m, 5, 50);
- * describe('Current minute is displayed');
+ * function setup() {
+ *   createCanvas(100, 100);
+ *
+ *   background(200);
+ *
+ *   // Get the current minute.
+ *   let m = minute();
+ *
+ *   // Style the text.
+ *   textAlign(LEFT, CENTER);
+ *   textSize(12);
+ *   textFont('Courier New');
+ *
+ *   // Display the minute.
+ *   text(`Current minute: ${m}`, 10, 50, 80);
+ *
+ *   describe(`The text 'Current minute: ${m}' written in black on a gray background.`);
+ * }
  * </code>
  * </div>
  */
@@ -65,18 +110,123 @@ p5.prototype.minute = function() {
 };
 
 /**
- * Returns the number of milliseconds (thousandths of a second) since
- * starting the sketch (when `setup()` is called). This information is often
- * used for timing events and animation sequences.
+ * Returns the number of milliseconds since a sketch started running.
+ *
+ * `millis()` keeps track of how long a sketch has been running in
+ * milliseconds (thousandths of a second). This information is often
+ * helpful for timing events and animations.
+ *
+ * If a sketch has a
+ * <a href="#/p5/setup">setup()</a> function, then `millis()` begins tracking
+ * time before the code in <a href="#/p5/setup">setup()</a> runs. If a
+ * sketch includes a <a href="#/p5/preload">preload()</a> function, then
+ * `millis()` begins tracking time as soon as the code in
+ * <a href="#/p5/preload">preload()</a> starts running.
  *
  * @method millis
- * @return {Number} the number of milliseconds since starting the sketch
+ * @return {Number} number of milliseconds since starting the sketch.
+ *
  * @example
  * <div>
  * <code>
- * let millisecond = millis();
- * text('Milliseconds \nrunning: \n' + millisecond, 5, 40);
- * describe('number of milliseconds since sketch has started displayed');
+ * function setup() {
+ *   createCanvas(100, 100);
+ *
+ *   background(200);
+ *
+ *   // Get the number of milliseconds the sketch has run.
+ *   let ms = millis();
+ *
+ *   // Style the text.
+ *   textAlign(LEFT, CENTER);
+ *   textSize(10);
+ *   textFont('Courier New');
+ *
+ *   // Display how long it took setup() to be called.
+ *   text(`Startup time: ${round(ms, 2)} ms`, 5, 50, 90);
+ *
+ *   describe(
+ *     `The text 'Startup time: ${round(ms, 2)} ms' written in black on a gray background.`
+ *   );
+ * }
+ * </code>
+ * </div>
+ *
+ * <div>
+ * <code>
+ * function setup() {
+ *   createCanvas(100, 100);
+ *
+ *   describe('The text "Running time: S sec" written in black on a gray background. The number S increases as the sketch runs.');
+ * }
+ *
+ * function draw() {
+ *   background(200);
+ *
+ *   // Get the number of seconds the sketch has run.
+ *   let s = millis() / 1000;
+ *
+ *   // Style the text.
+ *   textAlign(LEFT, CENTER);
+ *   textSize(10);
+ *   textFont('Courier New');
+ *
+ *   // Display how long the sketch has run.
+ *   text(`Running time: ${nf(s, 1, 1)} sec`, 5, 50, 90);
+ * }
+ * </code>
+ * </div>
+ *
+ * <div>
+ * <code>
+ * function setup() {
+ *   createCanvas(100, 100);
+ *
+ *   describe('A white circle oscillates left and right on a gray background.');
+ * }
+ *
+ * function draw() {
+ *   background(200);
+ *
+ *   // Get the number of seconds the sketch has run.
+ *   let s = millis() / 1000;
+ *
+ *   // Calculate an x-coordinate.
+ *   let x = 30 * sin(s) + 50;
+ *
+ *   // Draw the circle.
+ *   circle(x, 50, 30);
+ * }
+ * </code>
+ * </div>
+ *
+ * <div>
+ * <code>
+ * // Load the GeoJSON.
+ * function preload() {
+ *   loadJSON('https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_day.geojson');
+ * }
+ *
+ * function setup() {
+ *   createCanvas(100, 100);
+ *
+ *   background(200);
+ *
+ *   // Get the number of milliseconds the sketch has run.
+ *   let ms = millis();
+ *
+ *   // Style the text.
+ *   textAlign(LEFT, CENTER);
+ *   textFont('Courier New');
+ *   textSize(11);
+ *
+ *   // Display how long it took to load the data.
+ *   text(`It took ${round(ms, 2)} ms to load the data`, 5, 50, 100);
+ *
+ *   describe(
+ *     `The text "It took ${round(ms, 2)} ms to load the data" written in black on a gray background.`
+ *   );
+ * }
  * </code>
  * </div>
  */
@@ -90,17 +240,32 @@ p5.prototype.millis = function() {
 };
 
 /**
- * p5.js communicates with the clock on your computer. The <a href="#/p5/month">month()</a> function
- * returns the current month as a value from 1 - 12.
+ * Returns the current month as a number from 1–12.
  *
  * @method month
- * @return {Integer} the current month
+ * @return {Integer} current month between 1 and 12.
+ *
  * @example
  * <div>
  * <code>
- * let m = month();
- * text('Current month: \n' + m, 5, 50);
- * describe('Current month is displayed');
+ * function setup() {
+ *   createCanvas(100, 100);
+ *
+ *   background(200);
+ *
+ *   // Get the current month.
+ *   let m = month();
+ *
+ *   // Style the text.
+ *   textAlign(LEFT, CENTER);
+ *   textSize(12);
+ *   textFont('Courier New');
+ *
+ *   // Display the month.
+ *   text(`Current month: ${m}`, 10, 50, 80);
+ *
+ *   describe(`The text 'Current month: ${m}' written in black on a gray background.`);
+ * }
  * </code>
  * </div>
  */
@@ -110,17 +275,32 @@ p5.prototype.month = function() {
 };
 
 /**
- * p5.js communicates with the clock on your computer. The <a href="#/p5/second">second()</a> function
- * returns the current second as a value from 0 - 59.
+ * Returns the current second as a number from 0–59.
  *
  * @method second
- * @return {Integer} the current second
+ * @return {Integer} current second between 0 and 59.
+ *
  * @example
  * <div>
  * <code>
- * let s = second();
- * text('Current second: \n' + s, 5, 50);
- * describe('Current second is displayed');
+ * function setup() {
+ *   createCanvas(100, 100);
+ *
+ *   background(200);
+ *
+ *   // Get the current second.
+ *   let s = second();
+ *
+ *   // Style the text.
+ *   textAlign(LEFT, CENTER);
+ *   textSize(12);
+ *   textFont('Courier New');
+ *
+ *   // Display the second.
+ *   text(`Current second: ${s}`, 10, 50, 80);
+ *
+ *   describe(`The text 'Current second: ${s}' written in black on a gray background.`);
+ * }
  * </code>
  * </div>
  */
@@ -129,17 +309,32 @@ p5.prototype.second = function() {
 };
 
 /**
- * p5.js communicates with the clock on your computer. The <a href="#/p5/year">year()</a> function
- * returns the current year as an integer (2014, 2015, 2016, etc).
+ * Returns the current year as a number such as 1999.
  *
  * @method year
- * @return {Integer} the current year
+ * @return {Integer} current year.
+ *
  * @example
  * <div>
  * <code>
- * let y = year();
- * text('Current year: \n' + y, 5, 50);
- * describe('Current year is displayed');
+ * function setup() {
+ *   createCanvas(100, 100);
+ *
+ *   background(200);
+ *
+ *   // Get the current year.
+ *   let y = year();
+ *
+ *   // Style the text.
+ *   textAlign(LEFT, CENTER);
+ *   textSize(12);
+ *   textFont('Courier New');
+ *
+ *   // Display the year.
+ *   text(`Current year: ${y}`, 10, 50, 80);
+ *
+ *   describe(`The text 'Current year: ${y}' written in black on a gray background.`);
+ * }
  * </code>
  * </div>
  */